Ingredients

  • 3 tablespoons white wine vinegar
  • 1 teaspoon Dijon mustard
  • 1/4 teaspoon kosher salt, plus more for seasoning
  • 1/4 teaspoon freshly ground black pepper, plus more for seasoning
  • 3 tablespoons pure olive oil
  • 1/4 pound Cabrales blue cheese, crumbled, plus 4 thin slices blue cheese
  • 1/4 pound frisee, washed and dried
  • 2 tablespoons butter
  • 4 large eggs
  • 8 slices ciabatta or Italian bread
  • 8 thin slices prosciutto

Method

  • Whisk together vinegar, mustard, 1/4 teaspoon salt, and 1/4 teaspoon pepper in a medium bowl.
  • Whisk in the olive oil until combined.
  • Fold in the crumbled blue cheese.
  • Add the frisee and toss well to coat the frisee with the dressing.
  • Season with more black pepper, to taste.
  • Heat a little of the butter in a small nonstick skillet over medium heat.
  • Gently crack an egg into a small dish, and then add to the pan with the butter and cook until the white is set and the yellow is slightly firm, about 2 minutes.
  • Season with salt and pepper and then gently turn the egg over and continue cooking for 1 minute.
  • The yolk should still be slightly runny.
  • Repeat with remaining butter and eggs.
  • Place the bread on a flat surface and top each with 1/4 of the frisee mixture, followed by 2 slices of prosciutto, and then an egg.
  • Place a thin slice of blue cheese on top of the egg and garnish with ground black pepper.
  • Place another piece of bread on top.
  • Repeat to make a total of 4 sandwiches.